Prediction of Blood Lactate Accumulation from Excess CO_2 Output during Constant Exercise

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概要

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• To determine the predictability ofblood lactate accumulation from excess C0_2 output derived from bicarbonate buffering of lactic acid during constant exercise, eight normal active volunteers were studied during three stages ofconstant exercise on a cycle ergometer. Three work rates consisted of 100% (stage I), 120% (stage II) and 150% (stage III) of each subject's anaerobic threshold (AT), each of which was lasted for 4 min. Excess C0_2 output (Ex C0_2, ml) at each stage of constant exercise was estimated from the integral of difference between total VC0_2 and aerobic VC0_2 (from regression line for VC0_2 and V0_2 at exercise intensities below the AT obtained in incremental exercise test). Ex C0_2 per body mass (Ex C0_2・mass^-1) was increased progressively with blood lactate (La) accumulation from rest to each stage of constant exercise. Mean values (± SD) in the measured La accumulation (ΔLa,_measured) and predicted La accumulation (ΔLa,_predicted) at three stages of constant exercise were 1.82 ± 0.83 vs 3.19± 1.70 for stage I, 5.58 ±3.47 vs 7.09± 3.28 for stage II and 12.19 ± 2.36 vs 12.74 ± 1.83 mmolレ^-1 for stage III, respectively. There was a significant difference between ΔLa,_measured and ΔLa,_predicted at stage I(p0.05) , but no significant differences between these two variables at stage II and III. The averaged difference from ΔLa,_predicted to ΔLa,_measured at stage III (0.55 mmolレ^-1) showed a tendency to be smaller than stage I(1.38 mmolレ^-1) and II (1.50 mmolレ^-1). On the other hand, ΔLa,_predicted was found to correlate very closely with ΔLa,_measured (r=0.954, P0.001, n=20). The results of this study suggest that the changes of La accumulation could be predicted from excess C0_2 output generated in constant exercises above the AT.

• 日本生理人類学会の論文

著者

• Hirakoba K

  Kyushu Inst. Technol.

• Hirakoba Kohji

  Department Of Biological Functions And Engineering Graduate School Of Life Science And Systems Engin

• Maruyama Atsuo

  Faculty of Education, Kagoshima University

• Maruyama A

  Kagoshima Univ.

• Maruyama Atsuo

  Faculty Of Education Kagoshima University

• Misaka Kohji

  Faculty of Education, Kagoshima University

• Misaka K

  Kagoshima Univ.

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